Which cranial nerve provides sensation to the posterior third of the tongue?
(A.) Fifth
(B.) Ninth
(C.) Eighth
(D.) Twelfth
Answer: (B). Ninth
Glossopharyngeal is the ninth (IX) cranial nerve and provides sensation to the posterior 1/3 of the tongue and pharynx area.
Trigeminal is the fifth (V) cranial nerve and provides sensation to the anterior 2/3 of the tongue.
Vestibulocochlear is the eighth (VIII) cranial nerve and provides hearing and balance.
Hypoglossal is the twelfth (XII) cranial nerve which innervates the motor muscles of the tongue.
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